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IB Physics HL C.5.1 Doppler effect Question Bank

Practise IB Physics SL/HL C.5.1 by applying doppler effect concepts to exam-style physics questions.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • identify the relevant physical quantity, model or diagram
  • apply the correct equation and units to the evidence
  • justify the result using conservation laws, fields or energy relationships

C.5.1—Doppler effect question 1

[Maximum number: 2]

Two loudspeakers, A and B, are driven in phase and with the same amplitude at a frequency of 850 Hz . Point P is located 22.5 m from A and 24.3 m from B. The speed of sound is 340 ms−1340 \mathrm{~ms}^{-1}.

Figure for Question C.5.1—Doppler effect question 1 — IB Physics HL

In another experiment, loudspeaker A is stationary and emits sound with a frequency of 850 Hz . The microphone is moving directly away from the loudspeaker with a constant speed v. The frequency of sound recorded by the microphone is 845 Hz .

Explain why the frequency recorded by the microphone is lower than the frequency emitted by the loudspeaker.

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